cache: introduce an abstract class for cache we can upgrade incrementally
Right now each class implements their own mechanism for validation, and
update. We start introducing abstract class to ultimately allow more
unification of the cache code.
The end goal of this series is to introduce a cache for some obsolescence
property, not to actually implement the cache. However, taking advantage of
adding a new cache to introduce the abstract class seems like a win.
This code was headed for core during the 4.3 cycle but never made it there. So
we starts with a copy in the evolve repository.
====================================Testingheadcheckingcode:CaseD-2====================================Mercurialchecksfortheintroductionofnewheadsonpush.Evolutioncomesintoplaytodetectifexistingbranchesontheserverarebeingreplacedbysomeofthenewonewepush.Thiscaseispartofaseriesoftestscheckingthisbehavior.CategoryD:remoteheadis"obs-affected"locally,butresultisnotpartofthepushTestCase1:remotebranchhas2changes,headispruned,otherisrewrittenbutresultisnotpushed..old-state:....*1changesetbranch....new-state:....*oldheadispruned..*1newbranchsucceedingtotheotherchangesetintheoldbranch..*1newunrelatedbranch....expected-result:....*pushallowed..*pushingonlytheunrelatedbranch:denied....graph-summary:....B⊗..|..Aø⇠○A'.. |/.. | ◔ C.. |/.. ● $ . $TESTDIR/testlib/push-checkheads-util.shTest setup---------- $ mkdir D2 $ cd D2 $ setuprepos creating basic server and client repo updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd server $ mkcommit B0 $ cd ../client $ hg pull pulling from $TESTTMP/D2/server (glob) searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files new changesets d73caddc5533 (run 'hgupdate' to get a working copy) $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkcommit A1 created new head $ hg debugobsolete `getid "desc(A0)" ` `getid "desc(A1)"` obsoleted 1 changesets $ hg debugobsolete --record-parents `getid "desc(B0)"` obsoleted 1 changesets $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkcommit C0 created new head $ hg log -G --hidden @ 0f88766e02d6 (draft): C0 | | o f6082bc4ffef (draft): A1 |/ | x d73caddc5533 (draft): B0 | | | x 8aaa48160adc (draft): A0 |/ o 1e4be0697311 (public): rootActual testing-------------- $ hg push --rev 'desc(C0)' pushing to $TESTTMP/D2/server (glob) searching for changes abort: push creates new remote head 0f88766e02d6! (merge or see 'hghelppush' for details about pushing new heads) [255] $ cd ../..